SLC7A11 and isolated focal cortical dysplasia type IIb: Recently, we showed for the first time strong expression of OS markers, in particular the light chain and catalytic cysteine/glutamate antiporter of the xc system (SLC7A11 referred to as xCT), in resected brain tissue of patients suffering from epileptogenic developmental malformations, namely focal cortical dysplasia (FCD) type IIb and tuberous sclerosis complex (TSC) 4.